(define (script-fu-sharp-blur img drw image-blur-radius edge-blur-radius edge-detect-amount edge-gamma-correction)

  (let* ((drawable-width (car (gimp-drawable-width drw)))
	 (drawable-height (car (gimp-drawable-height drw)))
	 (image (car (gimp-image-new drawable-width drawable-height RGB)))
	 (drawable (car (gimp-layer-new image drawable-width drawable-height RGB "Original" 100 NORMAL))))

    (gimp-image-undo-disable image)

    (gimp-selection-all img)
    (gimp-edit-copy drw)
    (gimp-floating-sel-anchor (car (gimp-edit-paste drawable FALSE)))

    (let* ((overlay-layer (car (gimp-layer-copy drawable TRUE)))
	   (mask-layer (car (gimp-layer-copy drawable TRUE))))

      (gimp-image-add-layer image drawable 0)
      (gimp-image-add-layer image overlay-layer 0)
      (gimp-image-add-layer image mask-layer 0)

      (if (> edge-blur-radius 0)
	  (plug-in-gauss-iir TRUE img mask-layer edge-blur-radius TRUE TRUE))
      (plug-in-edge TRUE img mask-layer edge-detect-amount 1)

      (let* ((mask-channel (car (gimp-layer-create-mask overlay-layer 0))))

	(gimp-image-add-layer-mask image overlay-layer mask-channel)

	(gimp-edit-copy mask-layer)
	(gimp-floating-sel-anchor (car (gimp-edit-paste mask-channel FALSE)))

	(gimp-image-remove-layer image mask-layer)

	(plug-in-gauss-iir TRUE image drawable image-blur-radius TRUE TRUE)
	(gimp-levels mask-channel 0 0 255 edge-gamma-correction 0 255)
	
	(gimp-image-undo-enable image)
	(gimp-display-new image)
	(gimp-displays-flush)))))

(script-fu-register
 "script-fu-sharp-blur"
 "<Image>/Script-Fu/Alchemy/Sharp Blur"
 "Blur image but retain edges."
 "Mark Probst (schani@unix.cslab.tuwien.ac.at)"
 "Mark Probst"
 "1998/10/11"
 "RGB RGBA GRAY GRAYA"
 SF-IMAGE "Image" 0
 SF-DRAWABLE "Drawable" 0
 SF-VALUE "Image blur radius" "8"
 SF-VALUE "Edge blur radius" "4"
 SF-VALUE "Edge detect amount" "4"
 SF-VALUE "Edge gamma correction" "2")